Fixed gravity settings dialog.
GCS: Fix to suppress lots of debugging messages

The rich alarms change introduced a bug which caused spewing
debug messages.
Merge pull request #317 from kubark42/modulesettings_adminstate

Rename ModuleSettings->State to ModuleSettings->AdminState
Merge pull request #377 from kubark42/gravity-dialog

Fixed gravity settings dialog.
Merge pull request #398 from peabody124/alarms_fix

GCS: Fix to suppress lots of debugging messages
Added header file with common physical constants.
Updated library functions to use physical constants file.
Updated flight modules to use physical constants file.
Updated PiOS files to use physical constants file.
Updated GCS files to use physical constants file.
Added the shared API directory to simulator targets.
Fixes for header files, floating point trig functions, and incorrect
conversions.
Added shared/api to GCS include directory.